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In ancient Ireland the population was much smaller than today and families generally stayed in the same area for many generations. In those times, it was usual for a person to be known only by one name.

The Gaelic Clann system gave people a common identity within the people of their tribe and the community. During the eleventh century as the population grew, there was a need for further means of identification.

The solution was to adopt a prefix such as Mac (Mc is an abreviation) or Ó. Mac means 'son of' while Ó means 'grandson of'. Mac surnames are generally of a much later date than Ó. The vast majority of Gaelic Irish surnames were created during the eleventh and twelfth centuries.

About 80% of Irish names used the Ó and 20% used Mac.

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12y ago
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15y ago

It means "son of," so a McDonald would be the son of Donald.

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Q: Does the Mc in Irish names have a meaning?
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